const path = require('path');
function resolve(dir) {
  return path.join(__dirname, dir);
}

const name ='知然-后台管理' // page title

module.exports = {
  //proxy server
  devServer:{
    proxy:{
      '/zhiran':{
        target:'http://localhost:8082',
        changeOrigin:true,
        ws:true,
        pathRewrite:{
          '^/zhiran':''
        }
      }
    }
  },
  //alias
  configureWebpack:{
    resolve:{
      alias:{
        "assets":resolve('@/assets'),
        "component":resolve('@/components'),
        "views":resolve('@/views')
      }
    }
  },
  // todo figure out
  chainWebpack(config){
    config.plugin('preload').tap(()=>[
      {
        rel:'preload',
        fileBlacklist:[/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include:'initial'
      }
    ])

    config.plugins.delete('prefetch')

    // todo figure out
    config
        .when(process.env.NODE_ENV !== 'development',
            config => {
              config
                  .plugin('ScriptExtHtmlWebpackPlugin')
                  .after('html')
                  .use('script-ext-html-webpack-plugin', [{
                    // `runtime` must same as runtimeChunk name. default is `runtime`
                    inline: /runtime\..*\.js$/
                  }])
                  .end()
              config
                  .optimization.splitChunks({
                chunks: 'all',
                cacheGroups: {
                  libs: {
                    name: 'chunk-libs',
                    test: /[\\/]node_modules[\\/]/,
                    priority: 10,
                    chunks: 'initial' // only package third parties that are initially dependent
                  },
                  elementUI: {
                    name: 'chunk-elementUI', // split elementUI into a single package
                    priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
                    test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
                  },
                  commons: {
                    name: 'chunk-commons',
                    test: resolve('src/components'), // can customize your rules
                    minChunks: 3, //  minimum common number
                    priority: 5,
                    reuseExistingChunk: true
                  }
                }
              })
              // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
              config.optimization.runtimeChunk('single')
            }
        )
  },





}
